/* eslint-disable */
import html2Canvas from "html2canvas";
import JsPDF from "jspdf";

const htmlToPdf = {
    getPdf(title) {
        html2Canvas(document.querySelector("#pdfDom"), {
            allowTaint: true,
        }).then((canvas) => {
            //内容的宽度
            let contentWidth = canvas.width;
            //内容高度
            let contentHeight = canvas.height;
            //一页pdf显示html页面生成的canvas高度, a4纸的尺寸[595.28,841.89];
            let pageHeight = (contentWidth / 592.28) * 841.89;
            //未生成pdf的html页面高度
            let leftHeight = contentHeight;
            //页面偏移
            let position = 0;
            //a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
            let imgWidth = 595.28;
            let imgHeight = (592.28 / contentWidth) * contentHeight;
            //canvas转图片数据
            let pageData = canvas.toDataURL("image/jpeg", 1.0);
            //新建JsPDF对象
            let PDF = new JsPDF("", "pt", "a4");
            debugger;
            //判断是否分页
            if (leftHeight < pageHeight) {
                PDF.addImage(pageData, "JPEG", 0, 0, imgWidth, imgHeight);
            } else {
                while (leftHeight > 0) {
                    PDF.addImage(
                        pageData,
                        "JPEG",
                        0,
                        position,
                        imgWidth,
                        imgHeight
                    );
                    leftHeight -= pageHeight;
                    position -= 841.89;
                    if (leftHeight > 0) {
                        PDF.addPage();
                    }
                }
            }
            //保存文件
            PDF.save(title + ".pdf");
        });
    },
};

export default htmlToPdf;
